Convert java.util.HashMap to scala.collection.immutable.Map in java

Question

I\'m using some Scala library from my Java code. And I have a problem with collections. I need to pass scala.collection.immutable.Map as a parameter of a method

Answer 1

Since Scala 2.13 you can use CollectionConverters to achieve that.

Having

Map javaMap = ...

First we convert it to mutable Scala map:

import scala.jdk.javaapi.CollectionConverters$;

var mutableScalaMap = CollectionConverters$.MODULE$.asScala(javaMap);

And then to immutable one:

var scalaMap = scala.collection.immutable.Map$.MODULE$.from(mutableScalaMap);